<!doctype html>
<html>

<head>
  <meta charset="utf-8">
  <title>主界面</title>
  <link href="1.css" type="text/css" rel="stylesheet">
</head>
<script>
  function skip(s) {
    window.location.href = s + ".html";
  }
</script>

<body>
  <h1>主界面</h1>
  <table align="center">
    <tr>
      <td><button class="b" onClick="skip('backup')">本地通讯录<br>备份</button></td>
      <td><button class="b" onClick="skip('recover')">本地通讯录<br>恢复</button></td>
    </tr>
    <tr>
      <td><button class="b" onClick="skip('book')">云端<br>通讯录</button></td>
      <td><button class="b" onClick="skip('record')">云端<br>备份记录</button></td>
    </tr>
    <tr>
      <td><button class="b" onClick="skip('auto')">自动备份<br>设置</button></td>
      <td><button class="b" onClick="skip('index')">退出登录</button></td>
    </tr>
  </table>
</body>

</html>